What's it cost to get a qualified application filled out?

What do you think it would cost on average to get an application filled out, if I were to use intent-based branding? I know it's a difficult question, cheers.

So the real question is, and I'm translating again...Hey man, I'm selling something expensive and I want people to fill out an application before I agree to talk to them.

What's it cost to get a qualified application filled out?